An investigation by a team of researchers in Chicago says that hawks colonize urban areas & # 39; looking for tasty snacks: backyard birds.
Scientists from the University of Wisconsin-Madison say that the wide availability of bird feeders in cities allows songbirds to thrive, and watch birds of prey.
& # 39; For hawks, the secret is gone: there is an abundance of prey & # 39; in the city, says Benjamin Zuckerberg, professor of natural ecology at the University of Wisconsin-Madison and senior author of the new study, which is published in Proceedings or the Royal Society B.
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According to researchers at the University of Wisconsin-Madison, hawks have increased in number, as more people in large cities feed songbirds in their backyards. the number of forest bird predators such as Cooper & # 39; s and hawks with sharp thighs have increased since the sixties
WHY ARE THERE MANY HAWKS?
The number of birds of prey in the forest, such as that of Cooper and of the sharply hawk, has increased enormously since the sixties.
The population explosion took place after pesticides that had caused them damage were banned and regulations were introduced to protect them from hunters.
The scientists say that the number of birds of prey in the forest, such as that of Cooper and the sharply cut hawk, has risen since the 1960s, when pesticides harmed them were banned and rules were introduced to protect them from hunters.
As their numbers increased, the birds flew to Chicago and other urban areas in search of food.
At the end of the 1990s, Hawks occupied 26 percent of Chicago locations, but after two decades, that number rose to 67 percent, according to the study.
Jennifer McCabe, a post-doctoral UW-Madison fellow who led the study, said that hunger seems to be the main reason why these birds literally go from forests to an urban jungle where trees are scarce.
A migrating hawk of a cooper has a power lunch of a pigeon on F St. NW. As their numbers increased, birds flew to Chicago and other urban areas in search of food.
I was surprised that the coverage of the treetops was not important in colonization by these loggers, & # 39; said McCabe.
However, they do not nest in the winter, which means that they are more concerned about their own survival and not about raising young people.
& # 39; So it makes sense that the availability of food is so important. & # 39;
This phenomenon is not exclusive to Chicago.
The researchers say that this is part of a pattern that has also been observed in other urban areas in North America and in Europe.
And hawks are not the only predators looking for food in cities.
& # 39; Bears and puma in the United States, leopards in India and red foxes in Europe, just to name a few, & # 39; said McCabe.